Define relative velocity of one object w.r.t. another object. Draw position –time graphs for two objects moving along a straight line; when their relative velocity is (i) zero (ii) positive and (iii) negative..

Relative velocity is defined as the difference velocities of two vectors.
i.e. VAB = VA-VB


1) Positive relative velocity i.e. VA> VB

2) Zero relative velocity VA= VB



3) Negative relative velocity VA<VB

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